... Printed in Great Britain SYNTHESIS AND NMR SPECTROSCOPIC PROPERTIES OF SOME METHYL-SUBSTITUTED l-METHYL-1,4-DIHYDROPYRIDINES AJ de Koning, PHM Budzelaar, L. Brandsma, MJA de Bie and J. Boersma * Laboratory for Organic Chemistry, State University, 3522 AD Utrecht, The Netherlands ... M. Karplus, J. Chem. Phys., 33, 1842 (1960) AJ de Koning, HJ Albarts-Jansen, J. Boersma and GJM van der Kerk, to be published ...